Flow control nozzle for gasoline dispensers



Feb. 3, 1953 Filed May 8, i950 F. H. AlNswom-H l2,627,418

FLOW CONTROL NOZZLE vFOR GASOLINE DISPENSERS 2 SHEETS-SHEET l vSnne'ntor 38 Freedom JjnswoM/z,

Gttorneg Feb. 3, 1953 F. H. AlNswoRTl-l FLOW CONTROL NOZZLE FOR GASOLINEDISPENSERS 2 SHEETS--SHEET 2 Filed May 8, 1950 Patented Feb. 3, 1953FLOW CONTROL NOZZLE FOR GASOLINE DISPEN SERS Freedom H. Ainsworth,Salisbury, Md., assignor to The Wayne Pump Company, Salisbury, Md., acorporation of Maryland Application May 8, 1950, Serial No. 160,785

7 Claims.

This invention relates to flow control nozzles applicable to gasolinedispensing pumps, and it has particular reference tothe provision of animproved manually operable valved nozzle by means of which the liquidmay be delivered smoothly at all rates of flow.

Retail sales of gasoline to motorists are commonly made by causing theliquid to ow through a motor driven pump and meter unit into a dischargehose having a manually operable valved nozzle at its end, which isinserted into the filling opening of the gasoline tank. Many meter pumpsnow in service are provided with a register which indicates the moneyvalue of the gasoline, as well as the quantity ingallons. The motoristmayrask `for a tank full of gasoline, or a certain number of gallons, ora certain amount in terms of value. In each event, the attendantinvariably opens the nozzle valve to its fullest extent, after insertingthe end of lthe nozzle in the tank opening, in order to expeditedelivery. At the end of the operation, however, the attendant partiallycloses the nozzle and simultaneously watches the register, or the tankopening, so that the customers order may be exactly lled.

It is well understood that the partial closing of the delivery valve, inorder to reduce the rate of flow, is commonly attended by chatter orhammer in the hydraulic system, and that control and regulation of theflow rate by manipulation of the nozzle lever is a difficult matter.There has been, for many years, a demand and need for a gasolinedispensing nozzle so constructed as to minimize the burden on theattendant, and to alleviate the diiculties attending the variations inthe rate of flow. Various efforts have been made to solve the problem,but, insofar as I am advised, such proposals as have heretofore beenmade have been open to some practical objection. A survey of arepresentative number of service stations adequately establishes thatthe great majority of dispensing meter pump units are still equippedwith valved nozzles constructed in much the same manner as thoseemployed a score of years ago.

According to the present invention, a valved, manually operable,dispensing nozzle is provided, which, from superficial or exteriorappearance looks like the conventional type of nozzle. This, in itself,is `deemed to be an advantage, as the various makes of encased meterpumps are more or less standardized with respect to providing a hook orsupport for the nozzle when not in use, and controls through whichcurrent supply to the motor, and proper conditioning of the register,may be effected. An unconventional type of nozzle would therefore notreadily be applicable to many dispensers now in service.

Functionally, the improved nozzle includes valve elements which operateto shut oithe flow of liquid when the nozzle is closed, and to preventseepage or drainage of the liquid when the nozzle is not in use. foundin substantially all nozzles, and in fact are practically mandatory, arehere combined with a third metering valve element, adapted to operateconjointly with the other valve members, to regulate the variations inthe flow rate, in such manner as to eliminate pulsations or hydraulichammer. Stated otherwise, the present nozzle makes provision forcontrolling the iiow so that a low, as Well as high, ow rate may beobtained Without undue hardship on the attendant, or pulsations in thesystem. Provision is also made for hydraulically balancing the valveelements, thereby neutralizing one force tending to interfere withsmooth action, and also to damp any vibrations in the valve memberduring closing movement, thereby eliminating another source of chatterand erratic operation.

structurally, the improved nozzle is characterized by having relativelyfew parts for the fulfillment of its functions, and these are of simpleform, lending themselves readily to economical forming and finishingoperations. All parts of the nozzle are easily accessible for servicingor repair, should the need therefor arise. More specifically considered,the nature of the invention will be apparent from the following detaileddescription of a preferred embodiment, illustrated in the accompanyingdrawing, wherein:

Fig. l is an elevation of the dispensing nozzle;

Fig. 2 is an enlarged fragmentary axial section through lthe nozzle,with the valve elements shownv in closed position;

Fig. 3 is an additionally enlarged fragmentary section similar to thesection of Fig. 2, showing the valve elements at the instant of initialopenmg or final closing movement, and with one of the valve elementsturned at forty-five degrees to the position shown in Fig. 2;

Fig. 4 is a fragmentary section similar to Fig. 2, with the valveelements in fully open position;

Figs. 5, 6, and '7 are sections respectively taken gn tlecorrespondingly numbered section lines in 1g.

Fig. 8 is a bottom plan of the valve sleevebody;V

Fig. 9 is a bottom plan of the shut-off valve element Fig. 10 is aperspective of the metering valve" element; and,

These two functions, which are Fig. l1 is a perspective of the check ordrain prevention valve element.

Referring first to Figs. l and 2, it will be seen that the nozzlecomprises a main body 2l having a substantially cylindrical hollow inletsection 22 at one end, provided with internal threads 23 for attachmentto the coupling of a discharge hose. The section 22 merges into a mainvalve chamber portion 24, which in turn is contiguous with a dischargesection 25, provided with internal threads 26 to receive a coupling nut2l secured to one end of the delivery spout 28. The inlet and dischargesections are further interconnected by a guard 29 having a slottednormally disposed portion 3l at the inlet end, a portion 32 spaced fromand substantially parallel to the inlet section 22, and an angularlydisposed portion 33.

A web 34, interposed between the discharge section 25 and the guardportion 33, is suitably drilled to receive a pivot pin 35 which passesthrough aligned apertures in clevis sections 35 of an operating lever37, which is bent to provide a plunger actuating portion 38 andl a handgrip portion 39. As shown in Fig. 2, the end of the lever 31 rides inthe slot lil of the guard portion 3|, as the lever is shifted betweenthe extreme positions shown in the full and broken lines. When in thefull line or closed valve position, the guard portions 3l and 32, inconjunction with the slot 4I and the end of the lever 3l, may beutilized in conjunction with the dispenser nozzle support to lock orotherwise secure the nozzle to the pump casing, and preclude improperoperation of the apparatus. It may be noted that the lever 3l isconnected to the web 35 through a xed or single pivot point. It hasheretofore been proposed to incorporate movable or compound pivot pointsfor nozzle operating levers with the hope of increasing smoothness andease of operation. As will be made more apparent hereinafter, thisexpedient is not necessary for satisfactory performance of the presentinvention.

The valve chamber portion 24 is open at opposite ends, the upper endopening being of relatively large diameter, and internally threaded toreceive a cupped closure and retainer cap 43. The lower end of theportion 24 is formed with an opening of less diameter, which is providedwith threads 44 into which is tted an axially drilled gland nut 45,extending through thevalve body toward the lever 37. The` nut 45provides a guide'bearing for a plunger ro 45, which, when the valve isclosed, projects downwardly into engagement with the portion 38 of thelever 3l. The joint between the plunger l and the gland 45 is madeliquid tight by means of packing il? and a'knurled compression nut 4Sand follower 49. It will be readily apparent that, as the lever 3l ismanipulated, the plunger l5 will move linearly in and out of the valvebody.

The midportion of the valve chamber 25 is finished to provide acylindrical cavity, communicating, through ports and 52, respectivelywith the inlet and discharge sections 22 and 25. It will be seen thatthe inlet and outlet ports are spaced both axially and circumferentiallyof the chamber. A sleeve 53, formed with end walls 55 and 55, is tightlyfitted into the bore of the chamber 24, thereby to provide a iiuid tightjoint between the bore and the contacting portionsof the sleeve, andprevent seepage or direct flow between the ports 5l and 52 (see alsoFig. 3). The sleeve 53` is provided with an axial bore 55which iseccentric with respect to the axis ofthe-sleeve,`

as will be readily apparent from the various sectional views.

Referring also to Fig. 6, it will be seen that the space between the endwalls 55 and 55 is relieved, or is not as large in radius as the ends,to provide a cylindrical wall 5? delimiting the eccentric bore 55. Therelieved portion thereby increases in radial length from a minimum onone end of a reference diameter D-D, to a maximum at the opposite end ofthe same diameter. This space, designated by the reference numeral 55 inFig. 6, may, for want of a more apt term, be called a volute dischargechamber, although obviously its contour is not necessarily a truespiral. It will be noted also that the maximum radial length of thevolute chamber is on the downstream side of the valve, the statedreference diameter D-D substantially coinciding with the longitudinalaxis of the valve body, and with the center of the discharge port 52.

The Wall 5l is formed with a plurality of ports 6l, 52, and 53, whichprovide communication between the bore 55 and the chamber 58. It will benoted that the ports 5i and 52 are spaced from and are symmetricallylocated with respect to the longitudinal axis or reference diameter D-D,while the port e3 is symmetrically located on such diameter, and facestoward the region of maximum volume of the chamber 58. It beingpresupposed that fiow through the nozzle from inlet to dischargesections is through the ports 6l, 52, and 53, the purpose in making thebore 55 eccentric with respect to the sleeve 53 may now be more fullyunderstood. Volumetric now' through these ports into the chamber 5B iscumulative from the upstream to the downstream side, or, statedotherwise, the volume of liquid discharging from the downstream side ofthe chamber 58 is greater than the volume discharging into the chamberon the upstream or small volume side. Hence, the increasing volume ofthe chamber 53 accommodates the increasing volume of liquid, therebycontributing to the overall performance. It should be stated, however,that while this feature has been found highly desirable for bestoperation, valved nozzles made in accordance with the broad principlesof the invention may be fabricated with concentrically located bores,and of course the precise porting arrangement may be modified.

As best shown in Figs. 3 and 8, the lower end of the sleeve 53 isbeveled on one side below the cylindrical end wall 55, to provide anarcuate foot 65 serving to locate the sleeve with respect to the bottomof the valve chamber 25, and also providing clearance around the glandnut 45. Referring further to Fig. 5, the upper end of the sleeve 53 isprovided with an annular valve seat 55 of generally triangular crosssection, delimited by an annular groove 5l and the internal wall of thebore 5G.

The bore 55 receives a spool or plug valve element, generally designatedby the reference numeral l5, and shown in perspective in Fig; 10. Thespool comprises a generally cylindrical body, of slightly less diameterthan that of the bore 55, so that it will freely t therein. The spool isaxially drilled to provide a duct l2, and the lower end is counterboredto provide a recess 'E3 which abuts the inner end of the plunger 55. Theupper end is also countersunk to form a recess l5, for a purpose whichwill immediately be made clear. The ends of the spool are turned toprovide a series of annular grooves l5, and, between` the -ends,v.the.spool is formedfwith spaans number of cavities or pockets 16, spacedfrom each other by ,webs 11 which maintain the spool properly alignedduring movement in the bore 56. Triangular notches 18, having theirapices adjacent the upper end of the spool 1|, extend downwardly andinwardly to merge into the pockets 16, and the upper end of the spool isformed with a diametrical slot 13.

As will be more fully pointed out hereinafter, the duct i2 enablesliquid to ow between the ends of the plug valve 1|, to provide balancingand damping functions. It will be seen that the duct is of relativelysmall diameter, compared to the diameter of the valve itself, or to theareas of the various ports. Too small a diameter for the duct 12 wouldrender the action unnecessarily sluggish, while too great a diameterwould detract from the desired damping action. To a certain extent, atleast, the diameter of the duct 12 will depend upon the pump pressure.As a practical example, when applied to a gasoline pump establishing,with open nozzle position, a delivery of about fifteen gallons perminute from the spout 28, the duct 12 may have a diameter ofone-sixteenth of an inch. Apart from permissible variations in thisdimension, it -will be seen that, in `any event, the duct 12 will be ofsmall diameter in comparison to the areas of the other opening-s.

A disc valve 8| is positioned above the valve element 1|, and is adaptedto seat on the annular valve seat 56. The element 8| comprises a flangeddisc 82 which is integral with a boss 83, and a resilientgasoline-resistant sealing washer 3d which iits into the disc 82, whichis retained by a metallic washer 85 and screw 85. The valve element 8|is urged toward the seat 56 by means of a helicalspring 81, which fitslover the boss 33 and is retained within the cavity of the cap 43. Itwill be noted that the head of the screw 85 enters the recess 14 of thevalve element 1|, and this is a comparatively loose connection, so thatthe valve element 8| may have considerable freedom for gyratorymovement, and thus be self-aligning with respect to its seat 35. Thevalve 8| constitutes the main or shut-01T valve of the nozzle. Byforming the main valve `with a plane seating washer 84 to seat on therather narrow annular seat 65, only the slightest opening movement isrequired to admit fluid into the duct 12, and thus hydraulically balancethe plug valve 1|. A very` slight additional movement exposes the apicesof the notches or metering ports 18, to admit liquid around the plugvalve 1| and into the passageways of the sleeve 53.

A check or drain prevention valve 9| is positioned on the downstreamside of the nozzle in the section 25. This valve includes an externallythreaded annulus 92, positioned in internal threads 93 formed in thesection 25. The annulus 92 is formed with a diametrically positionedarched spider 94, the center of which is drilled to form a bearingaperture 95. The outer end surface of the annulus is finished to providea flat valve seat 53. A valve element 31 is made up of a disc 98 havingan integral boss 99 on one end and a pin lill on the opposite end, whichis threaded adjacent the disc to receive a retaining washer |02 and nut|03. The end of the pin lill is guided in the aperture 95, and the valveelement 91 is urged toward its seat by a conical spring |04, the cuterend of which abuts the inner end of the nut 21. As is customary withgasoline nozzles, the rate of the spring |04 is such as tocause thevalve 9| to open when subjected to pump discharge pressure, and toretain the valve on its seat when the nozzle is not in use, thereby toprevent drainage or leakage.

When the operating lever 31 is in the full line position as shown inFig. 2, the spring 81 forces the shut-01T valve 8| against the seat 36,and this in turn forces the plug valve 1| and. plunger 46 downwardly, toposition the upper end of the valve 1| slightly below the seat 66, andto maintain the plunger 46 against the section 38 of the lever 31. Theclosing of the valves 8| and 1I releases the pump pressure from thecheck valve 9|, which thereupon closes under the urge of the spring IM.Upon starting the pump, hydraulic pressure is exerted against the inletside of the valve 8|, thus imposing an additional force holding thevalve closed, and `the pump will short circuit itself through the usualbypass relief valve. The attendant then places the spout 28 in the llingopening of the automobile, and squeezes the lever section 39 toinstitute delivery.

As the valve 8| is unseated, the initial flow of liquid is under thevalve washer 84, over the edge of the seat 36, and through the slot 19of the plug valve 1|, into the duct 12, and thence into the space belowthe valve 1|, as shown in Fig. 3. This initial flow thereby equalizesthe hydrostatic pressure on opposite sides of both valves 1| and 8|, andaccordingly reduces the force opposing the valve movement to thatimposed by the spring 81. Some liquid leaks into the annular grooves 15,thus serving as a lubricant to facilitate further the smoothness of theoperation. As the lever 31 is moved to a greater extent, the apices ofthe notches 13 become exposed, and flow will thereupon take place to thedischarge section 25, through the pockets 16 and ports 6|, 62, and 53 ofthe sleeve 53.

It will be noted that the initial ow through the notches 18 is quitelimited, inasmuch as the `area is small, and hence there is a highdegree of throttling. When the pressure on the discharge side of thenozzle reaches a sucent value, the check valve 3| will open, therebypermitting gasoline to ilow from the nozzle end. The rate of flowincreases as the valve continues to open, reaching a maximum in theposition shown in Fig. 4. Due to the balancing of fluid pressures onopposite sides of the plug valve 1|, the valve may be readily held inany desired 'posi'ticn,.and

hence a metered or trickle ow may be obtained without pulsation orchatter. It will be noted, particularly from Fig. 4, that when the valveis Wide open, the lower end of the spool 1| engages the bore 55 of thesleeve 53 below the ports or passageways 6|, 62, and 63. While there isa slight clearance between the plug valve 1| and the bore of the sleeve,it is insufficient to permit significant flow therethrough during thedispensing operation, and the space or compartment below the plug valve1| therefore remains full of liquid, at inlet pressure, to maintain thehydrostatic balance.

The attendant may release the lever 31 slowly, or even let it dropfreely. With the usual nozzles, a rapid release of the lever has beenattended by pronounced and severe hydraulic hammer, while attempts toclose the valve more slowly are frequently accompanied by chatter. Withthe present nozzle, it will be seen that the volume of liquid beneaththe plug valve 1| serves as a cushion to l dripping from the end of thespout 21.

retard valve closing, irrespective of how the-attendant manipulates thelever- Si. TheV action is more than a simple dash pot effect, for evenwith dash pot devices, there may be a flutter or vibration of the valveelement itself, which is reflected into the hydraulic system.

As the valve moves to closed position, the liquid trapped beneath thespool il flows back, for all practical purposes, through the duct T2,the relatively slow rate of now providing a damping effect andcushioning the closing movement. i There is, of course, some clearancebetwen the periphery of the lower end of the spool, and the wall 56 ofthe sleeve bore, and therefore it is possible for a few drops of liquidto leak through the clearance gap. It has been found that', to suchextent as flow occurs around the end of the spool, it is notdeleterious, being insufficient to interfere with proper closing of thecheck valve 9i, or to cause The pressure differential between the endsof the valve 7l is small, and of course the rate of flow diminishesgradually as the notches it become progressively covered. The iinalclosing movement takes place as the tips of the notches 'i3 are occludedby the wall 56, thus interrupting flow through the passageways 6i, 62,and i533 and thereupon the engaging but independently movable main valve8i finds its seat.

It will thus be seen that the present invention provides a nozzleparticularly adapted for use with gasoline dispensers, in whichprovision is made for balancing, metering, and damping, as well as forthe known effects of providing a main shut-off valve and a drainprevention check valve. While the invention has been described withrespect to a single and preferred embodiment, it will be apparent thatvarious changes may be made without departure from its principles andthe scope of the appended claims.

I claim:

1. A dispensing nozzle comprising a body having a valve chamber, aslidable plunger extending into said chamber at one end thereof, anoperating lever for moving the plunger into the chamber, a sleeve fittedin the chamber and having a lower end forming a closed fluid compartmentwith the wall of the chamber adjacent the inner end of the plunger, adischarge port formed in the body between the ends of the sleeve, aninlet port formed in the body above the upper end of the sleeve, thesaid upper end of said sleeve being above the discharge port and formingwith the wall of the chamber a fluid tight joint, said sleeve beingformed with an axial bore and with fluid passageways through the wall ofthe sleeve between the ends thereof, a seat on the upper end of thesleeve, a shut-ou valve positioned in the chamber above the sleeve andnormally seating on said seat, a spring in the chamber urging said.

shut-ofi valve to closed position, a plug valve in the bore of thesleeve and loosely engaging the shut-off valve at one end and theplunger at the opposite end, said spring thereby urging the plug valveand plunger downwardly with respect to said chamber, a duct in the plugvalve freely communicating with said. compartment and with the upper endof the plug valve adjacent the shutoff valve, tapered metering portsformed in the body of the plug valve adjacent but below the upperextremity thereof, additional larger ports also formed in the body ofthe plug valve in con munication with said metering ports and thepassageways` in the sleeve, a discharge section for the bodyl contiguous:with the valve chamber and the dischargev port, and a spring loaded`checkqval-ve positioned in said discharge section.

2. A dispensing nozzle comprising a body having a valve chamber andinlet and outlet ports communicating with the chamber, said ports beingmisaligned both axially and circumferentially of the chamber, a sleevein the chamber formed with a relieved central portion in constant fluidcommunication with the discharge port, the end portions of the sleevespanning the discharge port and forming with the wall of the chamber uidtight joints, one end portion of the sleeve terminating axially of thechamber in spaced relation tothe inlet port, said sleeve being formedlwith an axial bore disposed eccentrically to the axis of the sleeve,fluid passageways,V formed in the wall of the relieved portion of thesleeve,

said sleeve being so, positioned in the chamber that the relievedportion of greatest radial length is substantially aligned with thedischarge port, a plug valve slidably mounted in the bore, meteringports and cavities formed in the surface of the plug valve and adaptedto establish fluid communication between the inlet and outlet ports onlywhen the plug valve is open, an independent duct in the plug valvecommunicating with opposite ends thereof, a shut-off valve looselymounted on the inlet end of the plug valve,

a seat on the inlet end of the sleeveforthe shut-y off valve, a springinthe chamber engaging the shut-off valve and urging it toward its seat,and an operating plunger extending into the chamber at the end oppositethe spring and engaging the plug valve, the end of the sleeve adjacentthe plunger forming with said chamber a closed clearance space, saidplug valve duct freely communicating with said space.

3. A dispensing nozzle comprising a body having a valve chamber andinlet and outlet ports communicating therewith, a main valve seatdisposed transversely of the chamber, a main valve adapted to seat onsaid valve seat and a spring engaging the main valve to urge it towardits seat, said inlet and outlet ports being on opposite sides of theseat, a bore formed through the seat and extending therebelow, fluidpassageways formed in the wall delimiting said bore and in constantcommunication with the outlet port, a discharge chamber extending aroundthe wall of said bore, said chamber being lof progressively greaterradial length toward the outlet port, a plug valve slidably positionedin said bore, said plug valve having end portions engaging the internalwall of the bore and being of such length that it may move into the boreto lie below said main valve seat, cavities formed in the surface of theplug valve between its ends and adapted, when and after the plug valveis moved out of the bore to place the inlet port in communication withsaid passageways and thereby the discharge port, said plug valve furtherbeing of such length that, when moved its maximum operative distance outof the bore the inner end thereof is below said passageways, a plungerextending into said valve chamber and engaging the inner end of the plugvalve, an operating lever pivoted to the nozzle body for actuating theplunger to displacethe plug valve and thereby raise the main valve fromits seat, and a constantly open duct extending through the plug valveand independent of said cavities to admit fluid to the inner end of saidplug valve when the main valve is displaced, thereby to balance thefluid pressures on the ends of said plug valve.

4, AA dispensing nozzle comprising a body havtioned in the chamber andhaving end portions tightly engaging the wall of the chamber and areduced with the outlet port, one end of said sleeve and the wall ofsaid chamber forming a closed clearance space, said sleeve being formedwith an axial bore and a valve seat on one end around the bore, saidinlet port being above said valve seat, `a disc valve adapted to bepositioned on said seat, a spring urging the disc valve toward saidseat, passageways formed in said sleeve intermediate its ends and incommunication with the outlet port, a plug valve slidably positioned inthe bore and engaging the disc valve at one end, a plunger extendinginto the chamber and said closed clearance space and engaging theopposite end of the plug valve thereby providing means to move the plugvalve and simultaneously lift the disc valve from its seat, an axialduct formed in the plug valve, said duct being in fluid communicationwith the seating surface of the disc valve whereby, when said disc valveis freed from its seat fluid pressure is transmitted to said closedclearance space at the opposite end to hydraulically balance the plugvalve, metering ports formed in the surface of the plug valve adjacentthe disc valve end, and cavities formed in the surface of the plug valvebelow the metering ports and in communication therewith and with saidpassageways, said opposite end of the plug valve, when said plug valveis moved by said plunger, engaging the wall of the bore to provide aseal against substantial liquid flow from the clearance space below saidopposite end into said passageways.

5. A dispensing nozzle comprising a body having a valve chamber andspaced inlet and outlet ports communicating therewith, a sleevepositioned in the chamber and having an upper end positioned below theinlet port and a lower end below the outlet port, said lower end formingwith the wall of the chamber a closed clearance space, said upper endbeing above the outlet port, a bore formed in the sleeve, fluidpassageways formed in the sleeve intermediate its ends and communicatingwith the outlet port, the ends of said sleeve tightly fitting the boreto provide fluid tight joints between the inlet and outlet ports, ashut-off valve positioned between the inlet port and the upper end ofthe sleeve, a seat for the shut-off valve at the upper end of thesleeve, a spring in the chamber normally urging the shut-ofi valvetoward its seat and thereby interrupting iuid communication between theinlet port and the bore, a plug valve slidably posi.- tioned in saidbore `and adapted, when the shutoff valve is seated, to be contained inthe bore below said shut-off valve seat, a plunger extending into thechamber and said clearance space below the sleeve and having its innerend engaging the lower end of the plug valve, an operating lever formoving the plunger and thereby the plug valve, the upper end of the plugvalve, upon movement thereof by the plunger, engaging said shut-offvalve to unseat the same, a uid duct below the shut-off valve seatextending to the lower end of the plug valve and to said clearance spaceto transmit fluid pressure to the lower end of the plug valve when theshut-off valve is unseated, metering ports formed at the upper end ofthe plug valve, said ports being of progressively greater size from theupper toward the lower end of the plug valve, the lower ends of saidmetering intermediate portion communicating` ..10 ports beingadapted tocommunicate with said fluid passageways.

6. A dispensing nozzle comprising a body having an inlet section, a mainvalve chamber portion, and a discharge section, said valve chamberportion being formed with a chamber, a sleeve positioned in the chamber,a fluid inlet port formed between the inlet section and the valvechamber above the sleeve, a discharge port formed between the chamberand the discharge section and between the ends of the sleeve, saidsleeve having end portions tightly engaging vthe walls of the chamber toforestall direct fluid communication between said inlet and dischargeports, one of said ends forming with the valve body a closed clearancespace, said sleeve being relieved between its ends to form a dischargespace, said sleeve being further formed with a bore and with fluidpassageways between its ends to place said bore in fluid communicationwith said discharge space, a plug valve slidably positioned in saidbore, said plug valve being formed with a duct extending between itsends and with ports in the surface of the plug valve, said plug valve atone end and said duct being in constant open fluid communication withsaid closed clearance space, said plug valve ports being adapted to beclosed from said inlet port when said plug valve is fully positionedwithin the sleeve and to be in communication with said inlet port andwith the fluid passageways of the sleeve when said plug valve is movedto extend above the sleeve, a shut-off valve positioned above the plugvalve and adapted to close uid communication between said inlet port andsaid plug valve when said shut-off valve is in closed position, a springurging said shut-off valve and said plug valve into normally closedposition, a plunger extending from the exterior of the body into thevalve chamber and engaging the lower end of the plug valve within saidclosed clearance space, and an operating lever for moving the plunger.

7. A dispensing nozzle comprising a body having a valve chamber, asleeve formed with enlarged end portions tightly tted in said chamber,one end of said sleeve forming with the valve body a closed clearancespace, inlet and outlet ports respectively communicating with thechamber at the end of the sleeve opposite the clearance space andintermediate the ends thereof, said sleeve being formed with a boreextending between its ends and with fluid passageways communicating withsaid outlet port, a valve seat on the end of the sleeve adjacent theinlet port, a shut-01T valve positioned above said end and adapted to beseated thereon, a spring normally urging said shut-off valve toward itsseat, a plug valve slidably positioned in the bore of the sleeve andengaging the shut-off valve at one end, an open duct formed in the plugvalve and communicating with opposite ends thereof and with saidclearance space, said duct and clearance space being adapted to beplaced in fluid communication with said inlet port upon initial openingof the shut-off valve, thereby to balance the hydrostatic pressure uponthe ends of said plug valve prior to substantial movement thereof insaid sleeve, porting cavities formed in the walls of the plug valvebetween the ends thereof and adapted when and after said plug valve ismoved in the sleeve toward the inlet port to place said inlet port influid communication with said fluid passageways and said discharge port,said cavities being of less circumferential dimension at the inlet endof the plug 4valve than between the chamber and closed clearance spaceat vthe end opposite the shut-olf Valve and engaging the plug valve latone end, said plunger being offset from `th'endof the plug valve ductopening into said clearance space, and an operating handle for 'movingthe plunger into said chamber to displace i the plug and'shut-o valves.

FREEDOM 'I-I. AINSWORTH.

REFERENCES CITED- -'Iniollo'wing references are of record in the Yfiler-of', this lpatent:

Number YNumber 12 UNIT-ED STATES PA'INTS Name Date Haeseler Feb. 6, 1917Caswell Sept. 17, 1'931 Marvel Feb. l2J 1935 FOREIGN PATENTS CountryDate Great Britain of 1935

